The M-4 Alaskan Survival .45-70 is ridiculously awesome. With a .45-70 on top and a .45 LC/.410 on the bottom, this is about the smallest hand cannon you’ll ever fire. With only two shots, it’s a backup gun at best but it’s still pretty badass.
The only flaw seems to be a nasty problem of potentially striking the primer with the firing pin while loading if the chamber is closed too quickly and the safety is not engaged. Take a look at the strangest Derringer you’ll ever see in the video below.